Dishwashing machine



July 19, 1932. c' M, SNYDER I 1,867,634

DISHWASHING MACHINE I Filed Sept. 25, 1929 I TNESS afW M.

Patented July 19, 1932 UNITED STATES 7 PATENT? OFFICE CARL M. SNYDER, OF SYRACUSE,

NEW YORK, ASSIGNOR TO WALKER DISHWASHER CORPORATION, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE DISHWASHING MACHINE Application filed September 28, 1929. Serial No. 394,588.

This invention relates to a mechanical dishwasher involving the use of an openwork dish-supporting tray or basket operatively mounted within a vat containing a limited quantity of water or other washing fluid which is adapted to be impelled and circulated from the bottom upwardly through the dish-supporting tray or trays by any suitable means such as a rotary impeller or its This method of washing and rinsing has proven to be highly efiicient both from an economical and sanitary point of view but it has been found that even though all the contaminated washing fluid has been carefully discharged from the vat more or less foreign matter resulting from the washing operation still adheres to the inner-walls of the vat andto parts of the impeller and dish-supporting trays so that when the fresh water is recirculated through the dish-supporting trays for rinsing purposes some quantities of the foreign matter are dislodged and carried with the recirculated rinsing water across and upon the dishes.

The main object of the present invention is to provide a more efficient and hygienic means for and method of rinsing the dishes than has heretofore been practiced and thereby to overcome the objections to the former methods by introducing the fresh rinsing water into the upper portion of the vat around the upper dish-supporting tray in such manner that it will be projected in the form of spray jets inwardly and upwardly through and across the trays from the circumference toward the center where it is free to gravitate through the underlying dish-supporting tray or trays for additional rinsingpurposes.

One of the specific objects is to mount the apertured rinsing ring or pipe directly upon' one of the dish-supporting trays and preferably the uppermost tray in such manner that it may be removed and replaced with the tray from and within the vat.

Another object is to provide means whereby the rinsing ring will be connected to and disconnected from the the tray is placed into vat.

Other objects and uses relating to specificparts of the rinsing device will be brought out in the following description.

In the drawing Figure 1 is a vertical sectional View of the upper portion of a dishwashing machine with the upper dish-supporting tray therein and water supply pipe as and removed from the my improved rinsing device in operative position.-

Figure 2 is an enlarged top plan of the rinsing ring and its connection with the water supply pipe.

Figure 3 is an enlarged detailed sectional view taken in the plane of line 33, Figure 2.

Figure 4 is an enlarged detailed sectional view taken in the plane of line l -4, Figure 2. In order that the invention may be clearly understood I have shown the upper-portion of a vat -1- for receiving the washing fluid,

and one or more dish-supporting trays or baskets 2 forming a part of a dishwash ing machine in which the vat is shown as suspended from the lower side of a horizontal shelf evident, however, that the rinsing device may be used in connection with any other type of dishwashing machine using one or more openwork trays for receiving and supporting the dishes during the washing and rinsing operations and therefore the particular manner of supporting the vat 1- is immaterial and need not be further described.

The open upper end of the vat 1 is registered with a corresponding opening in the shelf .a which constitutes an exten sion of the vat by reason of its being secured thereto and is provided with an inturned mara' of a sink fixture A. It is ginal-ledge or annular flange 3.-- for receiving and supporting the upper portion of the dish-supporting tray or basket 2.

That is, the upper end of the basket is pro- I vided with an out-turned annular flange -5 resting upon the upper face of the ledge 3 for suspending the tray or basket with in the upper end of the vat and permitting said tray to be removed and replaced through the opening in the shelf when the lid 4.-' is opened.

The tray 2 is preferably of the circular openwork wir'e type and is provided with a frusto conical bottom 2 having its center portion open to permit access therethrough to the dishes in an underlying tray if necessary, the junction of the frusto conical bottom portion 2' with the outer circular marginal walls of the tray or basket being depressed to form what may be termed an annular groove 6 A circular rinsing pipe or hollow ring 7 of slightly less diameter than themterior diameter of the basket is seated and supported in the annular groove '6 and is provided with a series of relatively small apertures 8 in its upper inner side preferably in uniformly spaced relation circumferentially and at relatively short intervals throughout the length of the pipe for discharging the rinsing water inwardly and upwardly from the circumference through the tray or basket and thereby to impinge against the surfaces of the dishes within the basket for rinsing or washing purposes.

The pipe ring 7- is preferably divided through one side at 9 and its ends spaced a short distance apart but firmly coupled to each other by a hollow coupling section 10- which is also provided with one or more upwardly and inwardly extending apertures -11 to permit the passage of the rinsing fluid therethrough.

The inner and outer walls of the groove 6 are spaced apart a distance corresponding approximately to the external diameter of the ring -7- and are slightly resilient so that when the ring is placedin the groove it will be frictionally held therein by said inner and outer walls against accidental displacement but still permitting said ring to be removed from the tray or basket by upward displacement when desired.

' The coupling section 10 preferably extends outwardly and downwardly from the adjacent portion of the rinsing ring 7- and has its lower end telescopically engaged with the upturned inner end of an inlet nozzle 12 which extends through and'is secured to the adjacent upright wall of the vat -1 and is rigidly held in operative position by a lock nut 12'-, Figure 3.

The outer end 'of the nozzle 12 is connected to a water supply pipe 13- having a valve 14 by which the supply of rinsing fluid to the interior of the ring -7 may be controlled.

The connection between the coupling section 10 and nozzle -12- constitutes what may be termed a slip joint or telescopic pipe connection -15 in which the upper end of the nozzle -12- normally extends into the interior of the lower end of the section 10- so as to enable the rinsing fluid to pass directly from the nozzle into the ring 7 without the use of coupling unions or other threaded members.

This slip joint or telescopic pipe connection 15 permits the dish supporting tray 2 with the rinsing ring -7 thereon to be removed and replaced through the open upper end of the vat when the lid is removed without disturbing the nozzle 12 or other parts of the machine.

The valve 14 is provided with an operating member 16 extending through the shelf -apreferably at the rear of the vat 1 for convenience of operation of the valve.

The vat is usually provided with an overflow, not shown, for limiting the volume of the washing fluid introduced within the vat to be operated upon by a rotary impeller, not shown, the maximum level of the washing fluid being indicated by a float-operated member -17- which also extends through the shelf a at the rear of the vat 1, shown in Figure 1.

Operation- The dishes to be washed and rinsed are placed edgewise vertically within the tray or basket 2 around the axis thereof, said tray with the dishes therein and the rinsing ring 7 thereon being then placed within the upper end of the vat 1 with the coupling section -10 telescopically engaged with the nozzle 12 after which the lid -4 is closed.

The washing operation is then begun and continued until the dishes within the tray are practically cleansed by the circulation of the water upwardly by means of an impeller, not shown. As soon as the dishwashing operation is completed the foul water is drawn off from the vat by any well known means, not necessary to here illustrate or describe, which leaves more or less foul matter adhering to the sides of the vat.

Heretofore it has been customary to introduce fresh water into the vat after the foul water has been drawn OE and this fresh water has then been circulated by the impeller through the dish supporting tray for rinsing the dishes, but owing to the fact that more or less foreign matter adheres to the interior wall of the vat the circulation of the fresh water carries some of the foreign matter through the tray and upon the dishes, which is, of course, more or less unsanitary for the reason that when the fresh rinsing water has been drawn ofl from the vat the foreign matter still adheresto the dishes which are frequently allowed to drain or dry while still in 5 the basket within the vat. It is to overcome this insanitary condition that I provide the special rinsing ring 7 to be used instead of the former method of rinsing.

10 That is, when the foul water has been drawn off, the valve 14 is opened to allow fresh Water to enter the ring 7 and to be distributed thereby from the outer marginal edge across the interior of the tray and 15 against the dishes for thoroughly rinsing the same, this operation being continued until the dishes are thoroughly rinsed after which the valve 14 is closed to allow the dishes to drain and dry while still held within the vat upon the tray 2, it being understood that during this rinsing operation the outlet of the vat may remain open.

What I claimis 1. In a mechanical dishwasher, the combination with a vat and a dish-supporting basket removably mounted within the vat, of a water supply nozzle secured in an opening in one side of the vat and projecting into said vat, and a perforated pipe ring operatively mounted upon the basket within the vat for removal therewith and having a telescopic pipe connection with said nozzle to permit the removal of the pipe ring without disturbing the nozzle.

2. In a mechanical dishwasher, the combination with a vat having an inlet nozzle in one side thereof some distance below its up per end, and a basket removably supported within the vat above the nozzle, of a perforat- 40 ed pipe ring supported within the basket and having a telescopic pipe connection with said nozzle to enable the basket with the pipe ring therein to be removed from the vat without disturbing the nozzle. 1

In a mechanical dishwasher, an openwork dish-supporting basket in combination with a pipe ring loosely supported on the bottom of the basket for upwa :d displacemen therefrom and provided on its inner side with a multiplicity of orifices, said pipe ring beiI'lg provided with means for receiving a wash 4. In a mechanical dishwasher, an openwork dish-supporting basket having a frustoconical bottom portion in combination with a pipe ring supported on the bottom of the basket and extending entirely around the base of the conical portion of said bottom, said pipe ring being. provided with means for re- Icieiving a washing fluid and with spray orices.

In witness whereof I have hereunto set In hand this 10th day of-Se tember, 1929.

- CAfiL M. SNYDER. 

